Effects of lysine to metabolizable energy ratio in the diet on growth performance and carcass characteristics of growing pigs

  • Janeth Josefina Colina Rivero Facultad de Ciencias Veterinarias. Universidad central de Venezuela
  • Miguel E. Diaz Facultad de Agronomia-UCV
  • Luis E. Manzanilla Facultad de Agronomia. UCV
  • Humberto E. Araque Facultad de Agronomia. UCV
  • Franklin E. Mora Facultad de Agronomía. UCV
  • Gonzalo E. Martínez Facultad de Agronomía. UCV


To evaluate the effects of dietary digestible lysine and metabolizable energy ratio (Lys:ME; g/Mcal) on growth performance and carcass characteristics of growing pigs, 70 crossbred barrows (Yorkshire × Landrace) were randomly allotted in a design of two complete blocks with five diets and seven replications of two pigs each. Pigs were fed ad libitum in two phases with diets containing 2.00, 2.29, 2.57, 2.85 and 3.14 g/Mcal in phase I (26.61-56.68 kg live weight) and 1.54, 1.77, 2.00, 2.22 and 2.45 g/Mcal in phase II (56.68-83.36 kg). Average daily feed intake (ADFI), average daily gain (ADG) and feed:gain ratio (FG) were evaluated. Backfat depth (BF) and longissimus muscle area (LMA) were measured and lean gain (LG) and lean yield (LY) were calculated. In the evaluated phases, ADG, ADFI and FG did not significantly differ among treatments. In Phase II, ADG increased and FG decreased linearly (P <0.05) with the ratio Lys:ME. In Phase I, the ratio affected (linear, P <0.05) BF. The greatest BF (4.67 mm) corresponded to 2.00 g/Mcal. The LG showed a quadratic (P <0.05) and linear (P = 0.01) response in Phases I and II, respectively, reaching 398 g/d with 2.85 g Lys/Mcal in Phase I. The ratio of Lys:EM within the range studied did not affect growth performance and the majority of carcass characteristics of growing pigs.


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Author Biographies

Janeth Josefina Colina Rivero, Facultad de Ciencias Veterinarias. Universidad central de Venezuela
Profesora Titular de la Cátedra de Produccion Animal de la Facultad de Ciencias Veterinarias de la Universidad Central de Venezuela. Master of Sci y PhD. en Nutrición Porcina
Gonzalo E. Martínez, Facultad de Agronomía. UCV
Director de Instituto de Producción Animal
How to Cite
Colina Rivero, Janeth Josefina, Miguel E. Diaz, Luis E. Manzanilla, Humberto E. Araque, Franklin E. Mora, and Gonzalo E. Martínez. 2013. “Effects of Lysine to Metabolizable Energy Ratio in the Diet on Growth Performance and Carcass Characteristics of Growing Pigs”. Archivos Latinoamericanos De Producción Animal 21 (4). https://ojs.alpa.uy/index.php/ojs_files/article/view/2304.
Original paper